Interplay between s-d exchange interaction and Rashba effect: spin-polarized transport

TL;DR

This paper explores how the s-d exchange interaction and Rashba effect influence spin-polarized transport in a 2D electron gas within a magnetic and electric field, revealing tunable beating patterns and resonant current enhancements.

Contribution

It demonstrates the interplay between s-d exchange and Rashba effects in spin transport, showing tunable magnetoresistance patterns and resonant spin current enhancement.

Findings

Beating patterns in magnetoresistance can be tuned by electric field.

Resonant enhancement of spin-polarized current observed.

Competition between s-d exchange and Rashba effect influences transport.

Abstract

We investigate the spin-polarized transport properties of a two-dimensional electron gas in a n-type diluted magnetic narrow gap semiconductor quantum well subjected to a perpendicular magnetic and electric field. Interesting beating patterns in the magneto resistance are found which can be tuned significantly by varying the electric field. A resonant enhancement of spin-polarized current is found which is induced by the competition between the s-d exchange interaction and the Rashba effect [Y. A. Bychkov and E. I. Rashba, J. Phys. C 17, 6039 (1984)].